In Richmond local residents are being asked to give their views in a referendum on night flights.
The borough's two MPs are united in their opposition to expansion and equally clear about night flights saying it is unfair on those living near the flight paths.
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The high of 35C was recorded on a Bakerloo line train between Piccadilly Circus and Oxford Circus at 2pm.
Weather forecasters say temperatures could reach 35C, beating the previous record of 34.6C in the scorching summer of 1976.
After years of political manoeuvring over the future expansion of Heathrow Airport, there has been an important development this lunchtime.